Don't forget the bats! Austin is home to the world's largest colony of Mexican Freetail bats, with more than a million of them living under the Congress Avenue Bridge downtown from April - October. They come out at sunset/dusk, so if you skip the Hula Hut, you can either watch them from the parking lot of the Austin American Statesman building south of Town Lake, and park your rental car in its parking lot, or watch from the Four Seasons Cafe on the north side. Other places of note in Austin are UT, of course, and the state Capitol building, which is free and open to visitors (and air conditioned if you are getting too hot in Austin in August!)